Protecting-hood for grinding-disks and for similar rotating objects and tools.



PATENTED .TULYJ24, 1906-.

FRIEDERIOHS. PROTECTING HOOD FOB GRINDING DISKS AND FOR SIMILARROTATINGOBJECTS AND TOOLS.

APPLICATION FILED IAB. 2a; 1905.

2 8HEBT8-BEEET 1.

INVENTDR TNI NORRIS rrrnzs 0a., WASHINGTON, n. c.

No- 826,842. PATENTED' JULY 24, 1906. H'. FRI'EDERIGHS.

PROTECTING HUOD FOR GRINDING DISKS AND FOR SIMILAR ROTATING OBJEGTS ANDTOOLS.

APPLICATION IILED MAR. 23, 1906.

2 SHEETS-SHEET 2.

THE mJRRIs PETERS co., WAsmuorcu, v. c.

UNITED STATES PATENT OFFICE.

HARRY FRIEDERICHS, OF HANOVER, GERMANY. PROTECTING-HOOD FORGRINDING-DISKS AND FOR SIMILAR ROTATING OBJECTS AND TOOLS.

Specification of Letters Patent.

ratenteo. Jury 24, 1906.

Application filed March 23.1905- Serial No. 251,603.

To all whom it Wtcty concern.-

Be it known that I, HARRY FRIEnERIoHs, chief engineer, a subject of theKing of Prussia, German Emperor, residing at 184' SchulenburgerLandstrasse, Hanover, Germany, have invented a certain new and usefulImproved Protecting-Hood for Grinding-Disks and for Similar RotatingObjects and Tools,

of which the following is a specification.

This invention relates to the protecting hoods or covers ofgrinding-disks, the object being to provide a form of hood which is ofadequate strength to resist and retain the flying fragments in the eventof a breakage of the disk, while at the same time it is sufficientlyelastic to permit of reduction in size as the diameter of the diskdecreases in wear.

Protecting-hoods with caps made from one piece of sheet metal are known;but these necessarily have been made of sufficient strength to resistthe fragments of a broken disk of maximum diameter, and consequentlyhave been too rigid or inelastic to permit of reduction in size.

The invention briefly consists in building up the hood from metalliclaminae, either plain or corrugated, so that a hood of the requiredstrength is obtained and at the same time one sufficiently elastic topermit alteration in size to suit the decreasing size of thegrinding-disk in wear, the decrease in size of the hood being furtherfacilitated by the laminae being so arranged that one or more can beremoved to decrease the resistance of the hood to alteration in shape.

The accompanying drawings illustrate two modes of carrying out theinvention.

Figures 1 and 2 are respectively front and side elevations of agrinding-disk with a plain form of hood according to the invention.Figs. 3 and 4 are detail views of the hood. Figs. 5 and 6 arerespectively front and side elevations of a grinding-disk with acorrugated hood according to the invention. Figs. 7, 8, and 9 are detailviews of the hood.

In carrying out the invention according to one mode, as illustrated inFigs. 1 to 4, the hood is built up from sheet-metal lamina a. These maybe formed by ending one piece on itself, so as to form two laminae, asshown in Fig. 2, or more than two may be so bent, as shown in Figs. 3and 4. It is preferred to form the hood in segments joined together, forinstance, by bolts 1). The free ends are formed with loops 0, throughwhich bolts (1 are passed. (See Fig. 4.) The hood is suslessening theeflect tained bythese boltsin conjunction with others d and e. The boltsd e are carried by arms or plates f g, which form aframework." Thisframework may be supported in any suitable manner, as by a bracket h.The hood passes from one bolt (if within the retaining-bolts e aroundthe disk to the other bolt d. As the disk i wears and decreases indiameter the bolts d e are shifted to other holes 7c in the frame-barsnearer the center of rotation. In addition to this the hood may befurther adjusted by moving the arms f on their connecting-bolts Z.

To facilitate the adjustment of the hood to a disk of greatly-decreaseddiameter, one of the laminae a may be removed to make the head moreflexible, as the strength required will be less, due to the decreasedeffect of the cerjtrifugal action in event of fracture of the dis r.

In carrying out the invention according to another mode, as illustratedby Figs. 5 to 9, the hood is built up from corrugated laminae. Thesegments are not bolted together, as in the previous case, but simplyheld together by bolts m, which are arranged on either side, so as tolock the corrugations of one segment within those of the other. Thisarrangement permits of adjustment atthis point of juncture. Similarlythe loops 0 may be dispensed with and the arrangement shown in Fig. 8adopted, in which the bolt is retained by a corrugation of the laminae.Figs. 7, 8, and 9 illustrate on a larger scale than the other figuresportions of the corrugated hood.

The similar parts in this modification of the invention to those in thatfirst described are correspondingly lettered.

It will be understood that the hood may always be adjusted close to thedisk, thereby of flying fragments in the event of fracture and that itmay be easily adapted to the decreasing size of the disk, as itspliabilty or elasticity can be decreased by removing one or more laminm,enough thickness being left of course to give the requisite strengt Theinvention is also applicable as a hood or cover for other revolvingparts or tools than grinding-disks.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is- 1. A protecting-hood for grinding-disks and otherrotating objects and tools, conand other rotating parts, consisting of anum ber of superimposed, flexible laminae, one or more of which can beremoved for facilitating 1 the adjustment of the hood; substantially asdescribed.

In Witness whereof I have hereunto signed my name in the presence of twosubscribing sisting of a number of associate, flexible laminae extendingover the entire length of the hood, said laminae consisting of severalparts joined together to form the hood, substantially as described.

2. A protecting-hood for grinding-disks and other rotating objects andtools, consisting of a number of associated flexible Witnesses. laminaeextending over the entire length of HARRY FRIEDERICHS. the hood,saidlaminae being corrugated; sub- Witnesses:

stantially as described.

ANNA DIPPEL, 3. A protecting-hood for grinding-disks HERMINE GoDEoKE.

